t.w.e.UnsupportedMethod(Exception) : class documentation

RFC 2616 (HTTP 1.1) gives us two choices when faced with this
situtation: If the type of request is known to us, but not allowed for the
requested resource, respond with NOT_ALLOWED. Otherwise, if the request is
something we don't know how to deal with in any case, respond with
NOT_IMPLEMENTED.

When this exception is raised by a Resource's render method, the server
will make the appropriate response.

This exception's first argument MUST be a sequence of the methods the
resource *does* support.